Estimate Means Comparison

Provides the confidence intervals for the means and mean difference of a specified comparison.

Usage

# S3 method for data.frame
estimateMeansComparison(frame, conf.level=.95, ...)

# S3 method for formula
estimateMeansComparison(formula, conf.level=.95, ...)

# S3 method for wsm
estimateMeansComparison(moments, corrs, conf.level=.95, ...)

# S3 method for bsm
estimateMeansComparison(moments, conf.level=.95, ...)

Arguments

frame

a set of (non-empty) numeric vectors of data values

formula

a formula of the form lhs ~ rhs where lhs is a numeric variable giving the data values and rhs a factor giving the corresponding groups

moments

a matrix/frame of descriptive/summary statistics

corrs

a matrix/frame of correlations among the measures

conf.level

confidence level of the interval

Details

This function compares two groups or variables. As such, the supplied factor or table of summary statistics should contain only two groups or two variables.

Value

The returned frame contains the following components:

Est

the estimates for the variables or groups and the difference

SE

the standard Errors for the variables or groups and the difference

df

the degrees of freedom for the variables or groups and the difference

LL

the lower limit of the confidence interval of the means and the difference

UL

the upper limit of the confidence interval of the means and the difference